To properly answer the question we really need to know more, such as when you want to display the contents of the file. A Makefile is not the same as writing in a scripting language - It does contain scripting language statements, but that is not the same as the purpose of a Makefile. A Makefile is to sequence the execution of statements written in another scripting language. The sequencing is to create files based on the dates and times of other files. Further Microsoft NMAKE is not the same as Make in various detailed ways (but in concept it is the same).
If the display of the contents of the file is linked to the creation of some file, then the answer is easy. If you want to display the text file every time the Makefile is executed then the solution might be very difficult. To just say Welcome to my Makefile from a file is harder than it seems. We have to know why you want to do this, so we can see if there is an alternate solution.
To display a text file is easy, as the commands in a an NMAKE script are Windows batch file commands. To display a file one uses the type filename
command:
all:
echo The file contains:
type filename
But this is probably not what you want.
Your second link to another article is not useful as this is about generic Makefiles in a linux context and not about NMAKE on a Windows platform, and thus would be no help to you.